3x+6x-9=5x-21x+21

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Solution for 3x+6x-9=5x-21x+21 equation:


Simplifying
3x + 6x + -9 = 5x + -21x + 21

Reorder the terms:
-9 + 3x + 6x = 5x + -21x + 21

Combine like terms: 3x + 6x = 9x
-9 + 9x = 5x + -21x + 21

Reorder the terms:
-9 + 9x = 21 + 5x + -21x

Combine like terms: 5x + -21x = -16x
-9 + 9x = 21 + -16x

Solving
-9 + 9x = 21 + -16x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '16x' to each side of the equation.
-9 + 9x + 16x = 21 + -16x + 16x

Combine like terms: 9x + 16x = 25x
-9 + 25x = 21 + -16x + 16x

Combine like terms: -16x + 16x = 0
-9 + 25x = 21 + 0
-9 + 25x = 21

Add '9' to each side of the equation.
-9 + 9 + 25x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 25x = 21 + 9
25x = 21 + 9

Combine like terms: 21 + 9 = 30
25x = 30

Divide each side by '25'.
x = 1.2

Simplifying
x = 1.2

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